clear out that here "not defined" just means to being defined

doc/doxygen/chapters/api/insert_task.doxy

@@ -36,8 +36,9 @@ appropriated objects as defined elsewhere.
 </ul>
 
 When using ::STARPU_DATA_ARRAY, the access mode of the data handles is
-not defined. One should use ::STARPU_DATA_MODE_ARRAY to define the
-data handles along with the access modes.
+not defined, it will be taken from the codelet ::modes or ::dyn_modes field. One
+should use ::STARPU_DATA_MODE_ARRAY to define the data handles along with the
+access modes.
 
 Parameters to be passed to the codelet implementation are defined
 through the type ::STARPU_VALUE. The function